LIX 3D Pen, launched on Kickstarter, is essentially the smallest three-dimensional printer in the world, in the form of a pen. The device is a portable pen, that enables you to “doodle in the air”. Powered by USB, the pen is plugged into a laptop or a computer that allow to heat up the pre-loaded plastic filament in ABS or PLA (polylactic acid) within 60-seconds and it cools as soon as it again as it comes out of the nozzle allowing to build different shapes. How do you erase these images?